[TowerTalk] Pseudo-Brewster Angle

[David Gilbert]

Uhh ... that should have been "shorting".

Dave   AB7E

On 3/2/2016 5:08 PM, David Gilbert wrote:
>
> Sorting the far ends of radials doesn't accomplish much of anything 
> other than maybe holding the wires in place.
>
> Dave   AB7E
>
>
> On 3/2/2016 8:50 AM, Mike & Becca Krzystyniak wrote:
>> What about shorting together the circumference in a ring?
>> How does that affect the angle?
>>
>> MK
>>
>> -----Original Message-----
>> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf 
>> Of N5KM
>> - Kris
>> Sent: Wednesday, March 02, 2016 12:07 AM
>> To: towertalk at contesting.com
>> Subject: [TowerTalk] Pseudo-Brewster Angle
>>
>> Reading the thread about an effective radial system got me thinking 
>> about
>> the pseudo-Brewster angle of a 1/4 wl vertical antenna. As strictly a 
>> mental
>> exercise, I calculated how much radial wire would be needed for an 80m
>> vertical Fresnel zone that results in a low (1-2 degree) pseudo-Brewster
>> angle. Assuming 120 radials of 5 wavelengths each that comes to 30 
>> miles of
>> wire on a parcel of at least 122 acres.
>>
>> The tips of the radial will be 68 feet apart. This raises the 
>> question is
>> this too far apart to affect the pseudo-Brewster angle? Devoldere 
>> says yes
>> (Low-Band DXing, 3rd ed.). He says they need to be no more than .05 
>> wl (13
>> feet) apart.
>> The return
>> currents will be nearly entirely collected by the close-in parts of the
>> radials. So that's not an issue. John doesn't show the math or other
>> analysis that leads to the
>> .05 wl figure so I'm not entirely convinced it's needed. However, if 
>> true,
>> that would require an additional 60 miles of wire.
>>
>> Kris N5KM
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